Mucky is wrong all 4 bolts are not a 72ft/lbs. ZButcher is right 72.5ft/lbs and 53ft/lbs. Bastosako is also right if you remove the back few allen bolts on skid plate and pull it down a tad you see to "plates" with square nuts welded to them. These run parrell to each other and can be replaced. Often over time and if you dont tighten them in the right order or to specs the bolt threads will stretch and the plates below will warp causeing the chain to periodicly come loose